Internal combustion engine

Abstract

An internal combustion engine including at least one cylinder, at least one in-block camshaft, at least one overhead intake valve and at least one overhead exhaust valve, as well as at least one rocker arm bracket per cylinder, the rocker arm bracket having an in particular tubular shaft on which are mounted at least one exhaust rocker arm and at least one intake rocker arm.

What is claimed is: 
     
       1. An internal combustion engine comprising:
 at least one cylinder; 
 at least one in-block camshaft; 
 at least one overhead intake valve, at least one overhead exhaust valve, and at least one rocker arm bracket per cylinder; 
 the rocker arm bracket having a shaft, at least one exhaust rocker arm and at least one intake rocker arm being mounted on the shaft; and 
 at least one spring on an outer circumference of the shaft, the exhaust and intake rocker arms movably mounted on the shaft being pressed axially against the rocker arm bracket by the at least one spring, 
 wherein at least one of the exhaust and intake rocker arms includes a bearing bore for the shaft, the bearing bore having a crescent-shaped groove therein which conducts oil to oil passages for lubricating both an adjusting screw on a pushrod side of the at least one of the exhaust and intake rocker arms and a thrust member on a valve side of the at least one of the exhaust and intake rocker arms. 
 
     
     
       2. The internal combustion engine as recited in  claim 1  wherein there are at least two of the overhead intake valves and at least two of the overhead exhaust valves per cylinder. 
     
     
       3. The internal combustion engine as recited in  claim 1  further comprising at least two pushrods per cylinder, the pushrods being inclined in a direction toward the center of the cylinder. 
     
     
       4. The internal combustion engine as recited in  claim 1  wherein at least one retaining ring or circlip is provided on the shaft. 
     
     
       5. The internal combustion engine as recited in  claim 1  wherein the rocker arm bracket is mounted on the cylinder head by at least two bolts. 
     
     
       6. The internal combustion engine as recited in  claim 1  wherein the rocker arm bracket has at least one groove. 
     
     
       7. The internal combustion engine as recited in  claim 1  wherein the shaft has at least one centering pin, the centering pin resting in a groove of the rocker arm bracket. 
     
     
       8. The internal combustion engine as recited in  claim 1  wherein the shaft and the exhaust and intake rocker arms have communicating grooves, the groove of the shaft communicating with the interior of the shaft via a hole. 
     
     
       9. The internal combustion engine as recited in  claim 1  wherein the rocker arm bracket is made of light metal. 
     
     
       10. The internal combustion engine as recited in  claim 1  wherein the shaft is tubular. 
     
     
       11. An internal combustion engine comprising:
 at least one cylinder; 
 at least one in-block camshaft; 
 at least one overhead intake valve, at least one overhead exhaust valve, and at least one rocker arm bracket per cylinder; 
 the rocker arm bracket having a shaft, at least one exhaust rocker arm and at least one intake rocker arm being mounted on the shaft, the rocker arm bracket having at least one groove, the shaft including at least one centering pin projecting from an outer surface of the shaft, the centering pin resting in a groove of the rocker arm bracket. 
 
     
     
       12. The internal combustion engine as recited in  claim 11  further comprising at least one spring, the exhaust and intake rocker arms movably mounted on the shaft being pressed against the rocker arm bracket by the at least one spring. 
     
     
       13. The internal combustion engine as recited in  claim 12  wherein the spring is in the form of a coil spring. 
     
     
       14. The internal combustion engine as recited in  claim 12  wherein the spring is in the form of a disk or diaphragm spring.